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When I did my GPM bucket test at the spigot I got 8 GPM. Rainbird told me it was to low. So I re-tested it in the basment right at the poly pipe off the meter, and I got 30 gpm. The spigot was reduced down to 1/2" where the main line was 1" and there were no elbows or valves to slow it down.
I think it would be important to test it right where you would connect the sprinkler main. I would test it closer to the pump and use the biggest line you have (no reducers)